That would be genetic engineering. This study involves the use of DNA and genes.
An experiment is a process where the a scientist tests and draws their evidence and data from. Hence, this process is where the hypothesis be supported or negated.
Variables are traits, factors, or characteristics that either manipulated or measured being the subject to become the data.
The independent variable is <span>B. </span>
<span>the presence of the new antibiotic</span>
Try looking up diagrams of Leaf structures, that would be my best solution sorry